[erlang-questions] ets:update_counter/3 optimal settings

Frank Muller frank.muller.erl@REDACTED
Fri Jun 9 10:13:06 CEST 2017

Thanks Jesper!


Le ven. 9 juin 2017 à 09:56, Jesper Louis Andersen <
jesper.louis.andersen@REDACTED> a écrit :

> On Fri, Jun 9, 2017 at 7:45 AM Frank Muller <frank.muller.erl@REDACTED>
> wrote:
>> Hi Everyone,
>> I've some troubles to understand the optimal settings for this little
>> simple problem:
>> Two Erlang processes A and B.
> If you need the speed, then measure. If you only have two processes,
> chances are that you can't measure any kind of difference really, because a
> single RX mutex would be enough for you to handle both processes. The
> read_concurrency and write_concurrency options tend to kick in at a certain
> core count and two processes can at most invoke 2 cores, and even then the
> chance is that they won't run at the same time in which case most of the
> points here are moot.
> Rule of thumb: a read or write to ETS takes less than 1us. So you can
> often run about a million of them per second.
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